Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

One fine day, an intellectual man came to the emperor's court with the aim of testing Birbal's wittiness. In order to do this, he challenged Birbal to answer his question and hence prove that he was as intelligent and witty as he was said to be.
He asked Birbal, Do you want me to ask one difficult question or a hundred easy ones?
Since both Akbar and Birbal had had a tough day and were eager to leave, Birbal hastily told the intellectual to ask him a single difficult question.
Intellectual: OK. Tell me what came first into the world, the egg or the chicken?
Of course, the chicken, Birbal replied with a smile.
This time with a note of victory in his voice, the intellectual asked Birbal, How will you demonstrate that?
What did Birbal say?

Which letter of the alphabet has the most water?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

What can go through glass without breaking it?